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https://issues.apache.org/jira/browse/DERBY-2351?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12575727#action_12575727
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Bryan Pendleton commented on DERBY-2351:
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I suppose one last try would be:
- unqualified ORDER BY reference: bind first to alias, then to column in (any)
underlying table
- qualified ORDER BY reference: bind first to column in corresponding
underlying table, then to alias
That would make the nasty query from synonym.sql work, I suppose,
but it doesn't feel like very pleasant code to need to write. If I could
start from scratch I'd prefer to make all these ambiguous cases be
errors, as I suspect that users don't really want to relabel one column
with an identical name to another column; they'd prefer to always choose
unique alias names and have no ambiguity about their queries.
> ORDER BY with expression with distinct in the select list returns incorrect
> result
> ----------------------------------------------------------------------------------
>
> Key: DERBY-2351
> URL: https://issues.apache.org/jira/browse/DERBY-2351
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.2.1.6, 10.2.2.0, 10.3.1.4
> Environment: Any
> Reporter: Yip Ng
> Assignee: Bryan Pendleton
> Fix For: 10.3.2.2, 10.4.0.0
>
> Attachments: d2351_aliasing.diff, d2351_aliasing.diff,
> d2351_aliasing_checkQualifiedName.diff, derby_2351.diff, derby_2351_v2.diff,
> reproTests.diff
>
>
> When distinct is in the select list and the query has order by with
> expression, the resultset produced contains an additional column.
> ij> create table t1 (c1 int, c2 varchar(10))
> 0 rows inserted/updated/deleted
> ij> insert into t1 values (1,'a'),(2,'b'),(3,'c');
> 3 rows inserted/updated/deleted
> select distinct c1, c2 from t1 order by c1;
> C1 |C2
> ----------------------
> 1 |a
> 2 |b
> 3 |c
> 3 rows selected
> ij> select distinct c1, c2 from t1 order by c1+1;
> C1 |C2 |3 <=====returns 3
> columns, incorrect result returned
> ----------------------------------
> 1 |a |2
> 2 |b |3
> 3 |c |4
> 3 rows selected
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